/* ==========================================================================
   /assets/site.css — 天生赢家 共享外壳
   深墨黑底 · 赛道绿信号 · 琥珀金节点 · 暖纸账本
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

ul, ol { padding: 0; }

img, svg, video { display: block; max-width: 100%; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 色板 */
  --ink: #0B0E11;
  --panel: #141A20;
  --line: #2A333C;
  --line-soft: rgba(42, 51, 60, 0.72);
  --muted: #8C98A4;
  --white: #E9EEF3;
  --paper: #F4EFE4;
  --paper-ink: #1A1F24;
  --green: #0BE881;
  --green-deep: #0A9C5E;
  --amber: #F5B301;

  /* 字体 */
  --font-head: "Sora", "Manrope", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺度 */
  --rail-w: 240px;
  --bar-h: 64px;
  --gutter: clamp(20px, 4vw, 56px);
  --content-max: 980px;
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  padding-top: var(--bar-h);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

strong, b { font-weight: 700; color: var(--white); }

::selection {
  background: var(--green);
  color: #04150C;
}

/* ---------- 4. 工具类 ---------- */
.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.muted { color: var(--muted); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 500;
  transform: translateY(-180%);
  padding: 0.62em 1.05em;
  border-radius: 999px;
  background: var(--green);
  color: #04150C;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline-color: var(--white);
}

/* ---------- 6. Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--bar-h);
  z-index: 100;
}

.topbar {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  height: var(--bar-h);
  padding: 0 var(--gutter);
  background: rgba(11, 14, 17, 0.9);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--line);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  padding: 4px 0;
}

.brand__mark {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(140deg, var(--green), var(--green-deep));
  box-shadow: 0 0 0 1px rgba(11, 232, 129, 0.32), 0 0 18px rgba(11, 232, 129, 0.3);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 2px solid #04150C;
  border-radius: 2px;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.02em;
}

.brand__sub {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.26em;
  color: var(--muted);
}

/* 版本徽标 */
.version-badge {
  flex: none;
  padding: 3px 8px 4px;
  border: 1px solid rgba(245, 179, 1, 0.45);
  border-radius: 6px;
  background: rgba(245, 179, 1, 0.1);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
}

/* 检索提示条 */
.topbar__hint {
  margin-left: auto;
  padding-left: 18px;
  border-left: 1px solid var(--line);
  max-width: 300px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: none;
}

.topbar__hint + .topbar__actions { margin-left: 0; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(20, 26, 32, 0.7);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-toggle:hover { border-color: var(--green); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--white);
  transition: background 0.2s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--white);
  transition: transform 0.22s var(--ease), top 0.22s var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 左侧竖栏导航 */
.rail {
  position: fixed;
  left: 0;
  top: var(--bar-h);
  z-index: 3;
  display: flex;
  flex-direction: column;
  width: var(--rail-w);
  height: calc(100vh - var(--bar-h));
  height: calc(100dvh - var(--bar-h));
  padding: 26px 0 18px;
  background: var(--ink);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 clamp(12px, 1.3vw, 18px);
}

.rail__item { display: block; }

.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--muted);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 16px;
  transform: translateY(-50%);
  border-radius: 2px;
  background: var(--green);
  transition: width 0.2s var(--ease);
}

.rail__link:hover {
  color: var(--white);
  background: rgba(233, 238, 243, 0.045);
}

.rail__link[aria-current="page"] {
  color: var(--white);
  font-weight: 700;
  background: rgba(11, 232, 129, 0.08);
}

.rail__link[aria-current="page"]::before { width: 3px; }
.rail__link[aria-current="page"] .rail__num { color: var(--green); }

.rail__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  color: #4E5B67;
  letter-spacing: 0.06em;
  transition: color 0.2s var(--ease);
}

.rail__label { display: inline; }

.rail__foot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding: 18px clamp(12px, 1.3vw, 18px) 0;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.rail__pulse {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(11, 232, 129, 0.18);
  animation: rail-pulse 2.6s ease-in-out infinite;
}

@keyframes rail-pulse {
  50% { box-shadow: 0 0 0 7px rgba(11, 232, 129, 0); }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45em;
  padding: 0.6em 1.15em;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--green);
  border-color: var(--green);
  color: #04150C;
}

.btn--primary:hover {
  background: #22F493;
  border-color: #22F493;
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--green);
  color: var(--green);
}

.btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #1A1206;
}

.btn--amber:hover { background: #FFC61F; border-color: #FFC61F; }

.btn--paper {
  background: var(--paper-ink);
  border-color: var(--paper-ink);
  color: var(--paper);
}

.btn--paper:hover { background: #2C343C; border-color: #2C343C; }

.btn--sm {
  padding: 0.42em 0.85em;
  font-size: 12.5px;
}

/* ---------- 8. Footer ---------- */
.site-footer {
  position: relative;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #0E1318 0%, #0A0D10 100%);
  padding: clamp(36px, 5vw, 64px) var(--gutter) 28px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: var(--gutter);
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--amber));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 0.85fr 1fr;
  gap: clamp(24px, 3.4vw, 56px);
  max-width: 1240px;
  margin: 0 auto;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  max-width: 360px;
}

.footer__name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.footer__mark {
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: linear-gradient(140deg, var(--green), var(--green-deep));
  box-shadow: 0 0 0 1px rgba(11, 232, 129, 0.3);
}

.footer__collect {
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.footer__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #5D6B77;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  list-style: none;
}

.footer__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(233, 238, 243, 0.82);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer__link:hover {
  color: var(--green);
  transform: translateX(2px);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.footer__contact-line {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--white);
  word-break: break-all;
}

.footer__note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  max-width: 1240px;
  margin: clamp(28px, 4vw, 46px) auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.footer__icp { color: var(--muted); }

/* ---------- 9. 页面容器与正文 ---------- */
.page-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(28px, 4.4vw, 64px) var(--gutter) clamp(64px, 8vw, 120px);
}

.prose {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(233, 238, 243, 0.86);
}

.prose p + p { margin-top: 1.1em; }

.prose a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { color: #22F493; }

.prose ul,
.prose ol {
  margin-top: 1em;
  padding-left: 1.25em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.45em; }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.breadcrumb li { display: inline-flex; align-items: center; }

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: #3A454F;
}

.breadcrumb a { color: var(--muted); transition: color 0.2s var(--ease); }
.breadcrumb a:hover { color: var(--green); }

.breadcrumb [aria-current="page"] { color: var(--white); }

/* 章节标题组 */
.section-head { display: flex; flex-direction: column; gap: 12px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--green);
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
}

.section-lede {
  max-width: 36em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 10. 带状模块 ---------- */
.band {
  padding: clamp(20px, 3vw, 40px) clamp(18px, 2.6vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.band:hover { transform: scale(1.012); border-color: #3A454F; }

.band--tight { padding: clamp(14px, 2vw, 24px) clamp(14px, 2vw, 26px); }

.band--green {
  border-color: rgba(11, 232, 129, 0.28);
  background: linear-gradient(120deg, rgba(11, 232, 129, 0.16), rgba(11, 232, 129, 0.02));
}

.band--green:hover { border-color: rgba(11, 232, 129, 0.5); }

.band--paper {
  border-color: transparent;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(26, 31, 36, 0.055) 1px, transparent 1px);
  background-size: 4px 4px;
  color: var(--paper-ink);
}

.band--paper .section-title,
.band--paper strong { color: var(--paper-ink); }

.band--paper .section-lede,
.band--paper .muted { color: #55606B; }

.band--paper .eyebrow { color: var(--green-deep); }
.band--paper .eyebrow::before { background: var(--green-deep); }

/* ---------- 11. 账本表格 ---------- */
.ledger {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.6;
}

.ledger caption {
  padding-bottom: 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.ledger th,
.ledger td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.ledger thead th {
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.ledger tbody tr:last-child td { border-bottom: 0; }

.ledger .num {
  text-align: right;
  white-space: nowrap;
}

.band--paper .ledger th,
.band--paper .ledger td { border-color: rgba(26, 31, 36, 0.14); }

.band--paper .ledger thead th { color: #5B6672; }

/* ---------- 12. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(196px, 1fr)); }

/* ---------- 13. 图片容器（页面阶段放 <img class="media__img">） ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }

.media__img,
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px 12px;
  background: linear-gradient(transparent, rgba(6, 9, 12, 0.88));
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(233, 238, 243, 0.92);
}

/* ---------- 14. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px 4px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(42, 51, 60, 0.35);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

.tag--green {
  border-color: rgba(11, 232, 129, 0.42);
  background: rgba(11, 232, 129, 0.1);
  color: var(--green);
}

.tag--amber {
  border-color: rgba(245, 179, 1, 0.42);
  background: rgba(245, 179, 1, 0.1);
  color: var(--amber);
}

/* ---------- 15. JS 注入：进度尺 / 返回顶部 ---------- */
.scroll-progress {
  position: fixed;
  top: calc(var(--bar-h) - 2px);
  left: 0;
  z-index: 120;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--green), var(--amber));
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(14px, 2vw, 26px);
  bottom: clamp(16px, 2.4vw, 28px);
  z-index: 130;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(20, 26, 32, 0.94);
  color: var(--white);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease),
              border-color 0.2s var(--ease), color 0.2s var(--ease),
              visibility 0.25s linear;
}

.to-top::before {
  content: "";
  width: 9px;
  height: 9px;
  margin-top: 3px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  border-color: var(--green);
  color: var(--green);
}

/* ---------- 16. 章节渐显 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html.js [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
  }

  html.js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1199px) {
  .topbar__hint {
    max-width: 200px;
    font-size: 12.5px;
  }
}

@media (max-width: 1100px) {
  .topbar__hint { display: none; }
}

@media (max-width: 1023px) {
  :root { --bar-h: 60px; }

  .nav-toggle { display: inline-flex; }

  .rail {
    width: min(84vw, 300px);
    z-index: 3;
    transform: translateX(-102%);
    transition: transform 0.32s var(--ease);
    box-shadow: 24px 0 60px rgba(0, 0, 0, 0.55);
    will-change: transform;
  }

  .rail[data-open] { transform: translateX(0); }

  .site-header::after {
    content: "";
    position: fixed;
    inset: var(--bar-h) 0 0 0;
    z-index: 2;
    background: rgba(4, 6, 8, 0.66);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.28s var(--ease);
  }

  .site-header[data-nav-open]::after {
    opacity: 1;
    pointer-events: auto;
  }

  body.is-nav-open { overflow: hidden; }

  .rail__link { padding: 13px 12px; font-size: 15px; }
}

@media (max-width: 860px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; max-width: none; }
}

@media (max-width: 767px) {
  .brand__sub { display: none; }

  .topbar { gap: 10px; }

  .topbar__actions .btn--ghost { display: none; }

  .topbar__actions .btn {
    padding: 0.5em 0.85em;
    font-size: 12.5px;
  }

  .prose { font-size: 16px; }

  .ledger { font-size: 14px; }

  .ledger th,
  .ledger td { padding: 10px 8px; }

  .to-top { width: 42px; height: 42px; }
}

@media (max-width: 560px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .topbar__actions .btn { padding: 0.45em 0.75em; }
}

/* ---------- 18. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .band:hover,
  .footer__link:hover { transform: none; }
}